256-ch, 16-bit digital x-ray AFE delivers best performance

256-ch, 16-bit digital x-ray AFE delivers best performance

The 256-ch, 16-bit ADAS1256 digital X-ray analog front end (AFE) is claimed to offer the lowest noise performance in multiple power-mode options, and the highest image quality — enabling a wide range of digital X-ray modalities, including portable radiology and mammography as well as high speed fluoroscopy and cardiac imaging. The part integrates the complete charge-to-digital conversion signal chain on a single chip by incorporating low-noise programmable-charge amplifiers, correlated double-sampling circuitry, and 16-bit A/D converters.

With a noise figure of an equivalent charge of 560 electrons at a 2-pC full-scale range, the ADAS1256 enables high resolution digital X-ray images while reducing patient exposure to X-ray dose. The device has multiple functional power modes ranging from 1-mW/ch to 3-mW/ch, allowing manufacturers to address a wide range of digital X-ray modalities including portable radiology and mammography as well as high speed fluoroscopy and cardiac imaging.

Additional features include power-down and sleep modes down to 0.005-mW/ch, on-board temperature sensor and reference buffer, on-board AFE timing sequencer, and user adjustable full-scale range up to 32 pC. The AFE allows up to 22 µs line time, so it can be used in dynamic imaging panels in addition to still image panels.

An SPI-compatible serial interface allows configuration of the AFE using SDI input. The SDO output allows the user to daisy chain several AFEs on a single 3-wire bus. ($256 ea/1,000 — available now)

By Christina Nickolas

Analog Devices , Wilmington , MA
Sales 800-262-5643
www.analog.com